Patents by Inventor Akira Nakamoto
Akira Nakamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6719537Abstract: A compressor has a pulley for transmitting torque from an external drive source to a rotary shaft to drive a compression mechanism. The pulley has a pulley body. The compressor has a mass body located in a range that is radially inward of the outer circumference of the pulley. The mass body swings about an axis that is spaced from the rotation axis of the pulley body by a predetermined distance and is substantially parallel to the rotation axis of the pulley body.Type: GrantFiled: March 6, 2002Date of Patent: April 13, 2004Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Masahiro Kawaguchi, Masaki Ota, Taku Adaniya, Akinobu Kanai, Takahiro Suzuki, Takeshi Kawata, Akira Nakamoto
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Publication number: 20020146326Abstract: A compressor has a pulley for transmitting torque from an external drive source to a rotary shaft to drive a compression mechanism. The pulley has a pulley body. The compressor has a mass body located in a range that is radially inward of the outer circumference of the pulley. The mass body swings about an axis that is spaced from the rotation axis of the pulley body by a predetermined distance and is substantially parallel to the rotation axis of the pulley body.Type: ApplicationFiled: March 6, 2002Publication date: October 10, 2002Inventors: Masahiro Kawaguchi, Masaki Ota, Taku Adaniya, Akinobu Kanai, Takahiro Suzuki, Takeshi Kawata, Akira Nakamoto
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Patent number: 6247902Abstract: A mechanism for attenuating torsional vibration in a compressor is described. The compressor includes a swash plate secured to a drive shaft and pistons coupled to the swash plate. Compression of refrigerant gas by the pistons generates torsional vibrations of the drive shaft. The rear end of the drive shaft is coupled to a damper for attenuating torsional vibrations. The damper includes a frictional plate secured to the rear end of the drive shaft, a weight rotatably fitted about the drive shaft, and a coil spring. The coil spring elastically presses the weight against the frictional plate and elastically couples the weight with the drive shaft. When the drive shaft torsionally vibrates, the weight contacts the frictional plate and is vibrated about the axis of the drive shaft by the coil spring. As a result, energy of the torsional vibrations is consumed and the vibrations are attenuated. Further embodiments show similar dampers attached to the exterior of the compressor.Type: GrantFiled: September 21, 2000Date of Patent: June 19, 2001Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Masakazu Obayashi, Naofumi Kimura, Akira Nakamoto, Kazuhiro Nomura, Hiroyuki Gennami
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Patent number: 6092997Abstract: A compressor having a rotating member, which includes a drive shaft and a swash plate. A piston compresses gas and torsionally vibrates the rotating member. A damper is coupled to the shaft to reduce torsional vibrations of the rotating member. The natural frequency of the damper is substantially equal to that of the rotating member. The damper includes a metal pin coupled to the shaft, a weight coupled to the rotating member, and a rubberlike body arranged between the shaft and the weight. The pin functions as a spring acting in the direction of the torsional vibrations and has a spring constant that remains substantially the same within the operating temperature range of the compressor. The weight is vibrated torsionally with the rotating member by the pin to offset the torsional vibrations of the rotating member. The natural frequency of the damper is determined mainly by the mass of the weight and the spring constant of the pin.Type: GrantFiled: November 5, 1998Date of Patent: July 25, 2000Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Naofumi Kimura, Akira Nakamoto, Masakazu Obayashi, Satoshi Koumura
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Patent number: 5983780Abstract: A compressor includes front and rear cylinder blocks, a drive shaft rotatably supported by the cylinder blocks, a swash plate mounted on the drive shaft, a plurality of cylinder bores defined in the cylinder blocks and located around the drive shaft, and a plurality of pistons respectively disposed in the cylinder bores. The pistons reciprocate by converting rotation of the drive shaft with the swash plate. A plurality of compression chambers are defined in the cylinder bores for compressing the gas supplied to the cylinder bores in accordance with the reciprocating movement of the pistons. Each compression chamber has dead volume defined by a space having a predetermined volume when the associated piston is at top dead center in each cylinder bore. A reference capacity is defined by the capacity when the piston is at a bottom dead center of the cylinder bore that has the smallest dead volume.Type: GrantFiled: November 18, 1996Date of Patent: November 16, 1999Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Akira Nakamoto, Kazuhiro Nomura, Takanori Okabe, Naofumi Kimura, Hayato Ikeda, Hiroyuki Gennami, Hisato Kawamura, Junichi Toyama
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Patent number: 5975860Abstract: A compressor includes a drive shaft rotatably supported by a housing, a swash plate supported on the drive shaft, a plurality of cylinder bores defined in the housing, a plurality of pistons positioned in associated cylinder bores and a clutch. The clutch engaged and disengaged by a solenoid. A dynamic damper is positioned on the rear side of the drive shaft. The dynamic damper includes an elastic portion made of rubber and a mass portion made of metal. In another embodiment, the mass portion of the dynamic damper has a plurality of radially extending projections. In a further embodiment, the dynamic damper has a ring shape and is fixed to the armature of the clutch.Type: GrantFiled: May 28, 1997Date of Patent: November 2, 1999Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Masakazu Obayashi, Satoshi Koumura, Naofumi Kimura, Akira Nakamoto
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Patent number: 5809865Abstract: A compressor that is constructed for reduced vibration during operation includes a cylinder having at least three cylinder bores, pistons being respectively positioned in the cylinder bores, structure for reciprocating the pistons; and structure for defining a dead volume between each of the pistons and cylinder bores. The dead volumes are divided into at least two groups, which include a large dead volume group and a small dead volume group, and wherein the large dead volume group includes at least two cylinder bores, whereby vibration is reduced during operation.Type: GrantFiled: February 13, 1997Date of Patent: September 22, 1998Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Hayato Ikeda, Akira Nakamoto, Hisato Kawamura, Noriyuki Shintoku
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Patent number: 5528976Abstract: A compressor has a swash plate supported on a drive shaft for an integral rotation. The swash plate is coupled to a plurality of pistons reciprocally moveable in a cylinder block to compress gas therein. Reaction force of the compressed gas applied to the piston and causing axial load acting on the swash plate and the drive shaft is buffered by buffer structure. The buffer structure comprises a first bearing interposed between a first surface of the swash plate and the cylinder block. The buffer structure has a second bearing interposed between a second surface of the swash plate and the cylinder block. One of the bearings is arranged to be flexibly deformable to absorb the axial load while the other bearing is arranged to be rigid to receive the axial load and transmit the axial load to the cylinder block.Type: GrantFiled: November 21, 1994Date of Patent: June 25, 1996Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Hayato Ikeda, Naoya Yokomachi, Satoshi Umemura, Kazuya Kimura, Hideo Mori, Hisato Kawamura, Akira Nakamoto
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Patent number: 5513967Abstract: The surface of a central section of a spiral element formed on a stationary or a movable scroll unit of a scroll type compressor is determined through the steps of locating an outer wall surface changing point G in a first polar coordinate system X, Y having a first origin O, drawing a circle Cs with its center at the first origin O and with a diameter corresponding to the orbital radius e of the orbiting motion of the movable scroll unit, locating a contact point P at a desired contact angle .beta. on the circle Cs, drawing a straight line m passing through the contact point P and the first origin O, drawing a straight line I passing the outer wall surface changing point G and inclined at a predetermined angle .alpha.Type: GrantFiled: March 15, 1995Date of Patent: May 7, 1996Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Akira Nakamoto, Masakazu Obayashi, Kazuhiro Nomura, Hirouki Gennami
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Patent number: 5483820Abstract: A method for zero correction in torque sensors, such as magnetostrictive torque sensor and strain gauge type torque sensor. Torque measurement is initiated when absolute values of torque signals are greater than a first set value, sampling measurement is carried out at predetermined intervals after the initiation. After absolute values of the measured torque signal values become lower than a second set value, an average value for a predetermined number of torque signal values whose absolute values are lower than a third set value is set as a new zero. The method permits proper measurement and correction of zero signals from torque sensors employed succesively at locations subject to impulse-like action of a torque load.Type: GrantFiled: April 1, 1994Date of Patent: January 16, 1996Assignee: Kubota CorporationInventors: Akira Nakamoto, Shiro Takada, Takuji Mori
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Patent number: 5412998Abstract: A torque measuring system can detect the magnitude of a torque applied to a torque sensing shaft and output a torque signal with respect to the torque. A torque sensor of the system has a measurement mode for producing torque signals and a correction mode for correction of its detection characteristics. An external signal for selection of one of the two modes is supplied to the torque sensor by a characteristic check device. The correction mode enables the correction of the torque sensor characteristics to be effected accurately and in a short time period without requiring manual labor.Type: GrantFiled: September 15, 1993Date of Patent: May 9, 1995Assignee: Kubota CorporationInventors: Akira Nakamoto, Shiro Takada, Akiyoshi Hanazawa, Kazunori Sakunaga, Takuji Mori, Taro Saito, Mutsumi Sunahata
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Patent number: 4946350Abstract: A capacity control arrangement controlling the capacity of a variable capacity wobble plate type compressor of a car air-conditioner driven by an engine of the car employs an engine load sensor, a compressor discharge pressure sensor, a car speed sensor, a compressor crankcase chamber pressure sensor, a miscellaneous air-conditioning data sensor, and a central processing unit to calculate and adjust a duty ratio value at which a solenoid-operated capacity control valve of the compressor is electrically driven. The adjustment of the duty ratio is carried out in such a manner when the engine load exceeds a predetermined value, the solenoid-operated capacity control valve first takes a fully open position to establish the lowest compressor capacity for an adjusted short period of time, and subsequently, takes a reduced opening position to maintain the lowest compressor capacity for as long as the engine load exceeds the predetermined value.Type: GrantFiled: February 23, 1989Date of Patent: August 7, 1990Assignee: Kabushiki Kaisha Toyoda Jidoshokki SiesakushoInventors: Shinichi Suzuki, Hiroshi Tanaka, Akira Nakamoto
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Patent number: 4846630Abstract: A variable wobble plate type compressor with a variable angle non-rotary wobble plate, having a suction chamber for a refrigerant before compression, a discharge chamber for a compressed refrigerant, compressing cylinder bores, pistons reciprocated by the wobble plate within the cylinder bores for compressing the refrigerant, a crankcase having a chamber to receive therein a drive and a wobble plate mechanism connected to the pistons to cause the reciprocating motion of the pistons and capable of changing the wobble angle thereof, a first passageway closably opened so as to apply a high discharge gas pressure of the discharge chamber to the drive and wobble plate mechanism within the crankcase chamber, a solenoid-operated plunger valve for controlling an introduction of a high pressure refrigerant gas from the discharge chamber into a high pressure chamber arranged in a part of the first passageway in response to a change in a cooling load, and a second passageway providing a fluid communication between the cType: GrantFiled: March 21, 1988Date of Patent: July 11, 1989Assignee: Kabushiki Kaisha Toyoda Jikoshokki SeisakushoInventors: Toshiro Fujii, Shinichi Suzuki, Akira Nakamoto
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Patent number: 4841737Abstract: A method for controlling the displacement changing mechanism of a variable displacement wobble plate type compressor arranged in a car air-conditioning circuit is carried out in a manner such that, when the operating condition of the compressor is stable and when hunting of a controlled variable of the air-conditioner, i.e., hunting of a temperature at the outlet end of an evaporator of the air-conditioning circuit, occurs, a manipulated variable to be given to the displacement changing mechanism to cause a change in the controlled variable is reduced so that hunting of the controlled variable is suppressed and the controlled variable reaches a desired value.Type: GrantFiled: May 12, 1988Date of Patent: June 27, 1989Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Toshiro Fujii, Shinichi Suzuki, Akira Nakamoto
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Patent number: 4838766Abstract: A method for controlling the compressor displacement of a variable displacement wobble plate type compressor having a solenoid-operated control valve unit for controlling the pressure level of a crankcase chamber of the compressor by controlling the duty ratio of an electric pulsive current to energize the solenoid-operated control valve unit, the frequency of the electric pulsive current being set and maintained at a low frequency, such as a frequency equal to or less than 1.0 Hz.Type: GrantFiled: December 3, 1987Date of Patent: June 13, 1989Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kazuya Kimura, Akira Nakamoto, Jun Hasegawa
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Patent number: 4747754Abstract: A variable wobble plate type compressor with a variable angle non-rotary wobble plate, having a suction chamber for a refrigerant before compression, a discharge chamber for a compressed refrigerant, compressing cylinder bores, pistons reciprocated by the wobble plate within the cylinder bores for compressing the refrigerant, a crankcase having a chamber to receive therein a drive and a wobble plate mechanism, connected to the pistons to cause the reciprocating motion of the pistons and capable of changing the wobble angle thereof, a first passageway closably opened so as to apply a high discharge gas pressure of the discharge chamber to the drive and wobble plate mechanism within the crankcase chamber, a solenoid valve for closing and opening the first passageway in response to a change in a cooling load, and a second passageway providing a fluid communication between the crankcase chamber and the suction chamber, a spool valve urged by a spring toward a first position opening the second passageway thereby pType: GrantFiled: September 4, 1987Date of Patent: May 31, 1988Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Toshiro Fujii, Akira Nakamoto, Shinichi Suzuki
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Patent number: 4448692Abstract: A liquid chromatograph comprising a reciprocating single plunger pump having a pair of check valves; a solvent supply passage, from the outlet check valve of the pump to a column; a driver means for the plunger of the pump; a control means for controlling the velocity of the plunger; the control means comprising a pressure detecting means disposed in the solvent supply passage, a memory means for storing a pressure signal obtained from the detecting means at a predetermined point between the initiation and termination of the suction, and a comparator means for comparing the stored pressure signal with a signal indicating a pressure which is derived from the pressure detecting means; the signal produced from the comparator means allowing the velocity at which the plunger is moved for delivery from the initiation of delivery stroke until the outlet pressure of the pump reaches the pressure at the predetermined point to be controlled so that it is greater than a velocity of the plunger set for the subsequent movType: GrantFiled: February 28, 1983Date of Patent: May 15, 1984Assignee: Shimadzu CorporationInventors: Akira Nakamoto, Katsuhiko Saito
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Patent number: D340198Type: GrantFiled: August 14, 1991Date of Patent: October 12, 1993Assignee: Shimadzu CorporationInventors: Akira Nakamoto, Nobuyuki Tatsumi